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I have plesk droplet with roundcube webmail.
I receive emails, able to send but not reaching the destination:
connect to alt2.gmail-smtp-in.l.google.com[142.250.150.27]:25: Connection timed out
After days of investigation, this is like DO blocking email to be sent via port 25:
# telnet smtp.gmail.com 587
Trying 108.177.15.108...
Connected to smtp.gmail.com.
Escape character is '^]'.
220 smtp.gmail.com ESMTP o6sm557170wrs.11 - gsmtp
quit
221 2.0.0 closing connection o6sm557170wrs.11 - gsmtp
Connection closed by foreign host.
# telnet smtp.gmail.com 25
Trying 108.177.15.108...
^X
quit
^C
samiam
abeen .
Jota Russo
CaiserSz
Wouter van Ooijen
SwimmingTealDolphin
699c9bc0a2c34f248e792cb8d2c6ab
e6317acc26184445891017fc7a2d90
87c210597c394f9ebe6ed063a4a6c7
jbopko
saferugdev
DriftingNavyStarfish